[Qemu-devel] [RFC][PATCH 10/14 v4] support detached dump

[Wen Congyang <wency@cn.fujitsu.com>]

Let the user to choose whether to block other monitor command while dumping.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 dump.c          |   24 +++++++++++++++++++-----
 hmp-commands.hx |    8 ++++----
 qmp-commands.hx |    7 ++++---
 3 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/dump.c b/dump.c
index 09ed96a..6acc252 100644
--- a/dump.c
+++ b/dump.c
@@ -74,6 +74,7 @@ typedef struct DumpState {
     char *error;
     Monitor *mon;
     int fd;
+    int detach;
     target_phys_addr_t memory_offset;
     int64_t bandwidth;
     RAMBlock *block;
@@ -110,6 +111,10 @@ static int dump_cleanup(DumpState *s)
         qemu_free_timer(s->timer);
     }
 
+    if (!s->detach && s->error) {
+        monitor_printf(s->mon, "%s", s->error);
+    }
+
     if (s->mon) {
         monitor_resume(s->mon);
     }
@@ -405,7 +410,7 @@ static target_phys_addr_t get_offset(target_phys_addr_t phys_addr,
     return -1;
 }
 
-static DumpState *dump_init(Monitor *mon, int fd)
+static DumpState *dump_init(Monitor *mon, int fd, int detach)
 {
     CPUState *env;
     DumpState *s = dump_get_current();
@@ -419,6 +424,7 @@ static DumpState *dump_init(Monitor *mon, int fd)
     s->block = QLIST_FIRST(&ram_list.blocks);
     s->start = 0;
     s->timer = NULL;
+    s->detach = detach;
 
     /*
      * get dump info: endian, class and architecture.
@@ -461,9 +467,12 @@ static DumpState *dump_init(Monitor *mon, int fd)
         s->phdr_num += s->list.num;
     }
 
-    if (monitor_suspend(mon) != 0) {
-        monitor_printf(mon, "terminal does not allow synchronous "
-                       "dump, continuing detached\n");
+    if (!detach) {
+        if (monitor_suspend(mon) != 0) {
+            monitor_printf(mon, "terminal does not allow synchronous "
+                           "dump, continuing detached\n");
+            s->detach = 1;
+        }
     }
 
     return s;
@@ -667,6 +676,7 @@ static int create_vmcore(DumpState *s)
 int do_dump(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     const char *file = qdict_get_str(qdict, "file");
+    int detach = qdict_get_try_bool(qdict, "detach", 0);
     const char *p;
     int fd = -1;
     DumpState *s;
@@ -695,11 +705,15 @@ int do_dump(Monitor *mon, const QDict *qdict, QObject **ret_data)
         return -1;
     }
 
-    s = dump_init(mon, fd);
+    s = dump_init(mon, fd, detach);
     if (!s) {
         return -1;
     }
 
+    if (s->detach) {
+        s->mon = NULL;
+    }
+
     if (create_vmcore(s) < 0) {
         return -1;
     }
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 98c1c35..ef0d53a 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -829,18 +829,18 @@ ETEXI
 
     {
         .name       = "dump",
-        .args_type  = "file:s",
+        .args_type  = "detach:-d,file:s",
         .params     = "file",
-        .help       = "dump to file",
+        .help       = "dump to file (using -d to not wait for completion)",
         .user_print = monitor_user_noop,
         .mhandler.cmd_new = do_dump,
     },
 
 
 STEXI
-@item dump @var{file}
+@item dump [-d] @var{file}
 @findex dump
-Dump to @var{file}.
+Dump to @var{file} (using -d to not wait for completion).
 ETEXI
 
     {
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 023cade..f359dff 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -573,9 +573,9 @@ EQMP
 
     {
         .name       = "dump",
-        .args_type  = "file:s",
+        .args_type  = "detach:-d,file:s",
         .params     = "file",
-        .help       = "dump to file",
+        .help       = "dump to file (using -d to not wait for completion)",
         .user_print = monitor_user_noop,
         .mhandler.cmd_new = do_dump,
     },
@@ -588,7 +588,8 @@ Dump to file.
 
 Arguments:
 
-- "file": Destination file (json-string)
+- "detach": detached dumping (json-bool, optional)
+- "file":   Destination file (json-string)
 
 Example:
 
-- 
1.7.1